Table 2.
Trends and uncertainties for CO datasets and eastern US AQS O3
| Period | EPA CO | Top-down CO | MOPITT CO | AQS CO | AQS O3 |
| 2005–2009 | −7.0% | −4.5 ± 1.1% | −2.7 ± 0.6% | −7.9 ± 1.3% | −1.6 ± 1.0% |
| 2011–2015 | −4.6% | −1.4 ± 1.1% | −1.4 ± 0.6% | −2.7 ± 1.3% | −0.4 ± 0.9% |
All trends are relative to the average of each data period (2005–2009 and 2011–2015) and based on a linear trend model. Uncertainties represent 1 σ and include the error budget discussed in SI Appendix. AQS O3 includes measurements over eastern US only (eastward of 100°W), whereas other datasets cover the whole US.